Colma, CA Noise Levels
Noise levels in Colma, CA
At 47.5 dB(A), Colma, CA falls inside HUD's "Acceptable" noise zone, 65 dB(A) day-night average or below under 24 CFR 51.104, the federal government's own line for building housing with no extra sound attenuation required. The main source is rail traffic, well ahead of the other two modes BTS tracks. That figure is sampled at one coordinate, the Census Bureau's own internal point for Colma, not a street-by-street survey of the whole place.
Where Colma's noise comes from
BTS models these three sources separately before combining them, so a place can be quiet on two and loud on the third.
If you're weighing a move to Colma
The same window and door upgrades that work on road noise also cut broadband rail noise, though very low-frequency freight rumble travels through walls, not just glass.
How Colma compares nationally
Colma ranks 3,190 of 3,622 measured places nationally, 1 being the loudest this dataset covers. About 1,428 people live there, making it the 8,910th largest place in this dataset.
Checking one address in Colma
Colma's figure above is a town-wide reading. For one exact address, BTS's own map is the free, authoritative source.
Where Colma's figures come from
Every dB(A) figure on this page traces to a named BTS dataset, documented in the methodology guide. The guide to what actually cuts each kind of noise explains why rail traffic calls for a different fix than the other two sources.